A kinetics study on PbGeO3 solid-solid phase transition was realised by means of differential scanning calorimetry and time-resolved X-ray powder diffraction. Isothermal and non-isothermal Johnson-Mehl-Avrami equations were applied to obtain both the activation energy Ea and the Avrarmi coefficient n. The latter parameter has been related to morphological evidences collected by scanning electron microscopy. The limits of the applied theory, i.e., the Arrhenian behaviour of the growth rate and a steady-state nucleation rate, are finally discussed in terms of recent theoretical developments.
|Titolo:||Isothermal and non-isothermal kinetic study of the PbGeO3 solid-solid phase transition|
SCAVINI, MARCO (Secondo)
|Parole Chiave:||Avrami coefficient; Germanates; Solid-solid phase transition; Time-solved XRPD|
|Settore Scientifico Disciplinare:||Settore CHIM/02 - Chimica Fisica|
|Data di pubblicazione:||1-lug-2005|
|Digital Object Identifier (DOI):||10.1016/j.tca.2005.02.036|
|Appare nelle tipologie:||01 - Articolo su periodico|